threeleveladj.三级的threenum.三n.三；三个adj.三个的three-span guardrail system三跨护栏系统three-stages teaching model三段式three-dimensional transform三维变形three -field coupling model三域耦合模型three-link energy structure三环节能量结构three pars plana sclerotomies两切口硅油取出three hundred and seventy two(=372) 三百七十二three point bending beam test三点弯曲梁试验Three-Tier Development Mode三层开发模式three dimensional interaction三维交互

1. On a hot day, a cool swim is a joy.
   大热天来次凉快的游泳是件乐事。
2. They lay by during the heat of the day.
   他们在白天最热的时候停下来休息。